With lack of or underdeveloped CB-ROMs and underdeveloped personal B-ROM, resources that would otherwise be used by them are freed up. Lesser amount of resources used for CB-ROMs and personal B-ROM by VP translates into LB using more resources, making it more powerful.

In detail: Due to brain plasticity, reduction or non-utilization of resources used by VP for both types of B-ROMs result into them being used by LB (based on the optimizing aspect of the evolutionary process), making it more powerful in sensory detection and other functions of LB
(as mentioned under title Logical Brain (LB)), so much so, that certain combination of such impairments result into savant capabilities.

Based on the above, as usage patterns are different between normal brains and
those with lack of or underdeveloped CB-ROMs and underdeveloped personal B-ROM,
structures of brains in both cases are built in different ways, as they are
distributed by their usage patterns (more under title Location and Architecture).

Lack of or degraded VP-LB communication affects implicit communication from LB, because of which, they have to remember and follow others in everything they do that needs such communication, improving their rote learning capabilities.

Note: The symptom of repetitive behaviour in autistic population comes under purview of my forthcoming work, and thus, is not included here.